Daikin AIRHUB Operation Manual page 13

Screen Brightness-LED Bar
3.5.
LED Bar
***NOTE: In relation to the LED Bar. The LED Bar will always be
active regardless of AC operation status. The LED Bar is inactivated
only when the screen sleeps (Screen Timeout: default 2min).
Upon touching an inactive screen, the screen will activate, a
subsequent touch will activate the LED Bar.
LED Bar
13